Fasco FM554 4-Wing Torsion-Flex Motor Mounting Bracket Kit | Fits 5.5" Diameter Motors | 9" & 10.18" Bolt Circles

The Fasco FM554 is a high-stability structural component designed to serve as the "cradle" for your blower motor, providing enhanced four-point support within the furnace cabinet. This OEM-authorized 4-wing mounting kit is specifically engineered for 5.5-inch diameter (48-Frame) motors, acting as the critical dampener that isolates high-speed rotational torque. By distributing the motor's weight across four points instead of three, the FM554 provides superior vibration management for larger horsepower motors found in high-velocity Carrier, Trane, and York furnace series. It functions as the physical interface that ensures the "body" of your air handler remains whisper-quiet while the "brain" (control board) manages airflow speeds.

Key Features

• Genuine Fasco OEM Quality: Engineered to precisely match part number FM554, ensuring the metal gauge and flex-tension meet factory safety standards for heavy direct-drive motors.
• 4-Wing High-Stability Design: Features a four-leg arrangement to fix issues with cabinet flexing and "thumping" during motor startup in high-static pressure systems.
• Dual Bolt Circle Compatibility: Universal mounting geometry supports both 9-inch and 10.18-inch bolt circles, allowing for seamless integration into various blower housing dimensions.
• Torsion-Flex Vibration Isolation: Specialized steel legs are designed to absorb harmonic frequencies, preventing the furnace cabinet from acting as a resonator for motor hum.
• Simplified Hardware Kit: Includes all necessary industrial-grade rubber grommets, washers, and steel bolts required for a complete, safety-certified installation.

Product Details

• Brand: Fasco (Regal Rexnord)
• Manufacturer Part #: FM554 (Also referenced as 66484)
• Shipping Weight: 2.25 lbs
• Motor Size Compatibility: 5.5-inch Diameter (5-5/8" Frame)
• Mounting Type: 4-Leg Torsion-Flex
• Bolt Circle Dimensions: 9.0" and 10.18"
• Material: Heavy-duty Zinc-Plated Steel
• UPC: 818508022888
• Safety Certifications: UL Recognized / CSA Certified

🛠️ HVAC Depot Pro Tip

Take a Picture First: Before removing the original bracket, photograph the orientation of the motor's capacitor and wiring leads relative to the bracket wings. This ensures you don't block the motor's ventilation holes or the control board's access panel with the new 4-wing configuration. Diagnostic Check: After installation, verify that each of the four rubber grommets is centered in the housing holes. If the bracket metal touches the blower housing directly, the vibration dampening will fail and cause a loud metal-on-metal rattle.

Cross-Reference

• Superseded / Legacy:

  TFM554, 66484

• Drawing / OEM Equivalents:

  FM-554, 1010325, 48-Wing-Kit

• Brand Equivalents:

  Fits motors from Emerson, GE, Genteq, and Century with 5.5" diameters.

• White-Rodgers/Emerson:

  4-Leg Universal Flex Mount

Model Compatibility

• Universal Blower Series (Suffixes: 9-Inch BC, 10-Inch BC, 10.18-Inch BC)
• High-HP Direct Drive Motors (Suffixes: 1/2 HP, 3/4 HP, 1 HP)
• Carrier/Bryant/Payne (Suffixes: 58STA, 58STX, 355MAV)
• Lennox G-Series (Suffixes: G40, G41, G51, G61)